Plinth

Plinth turns screenshots into studio-lit 3D mockups in your browser. Upload a PNG, JPG or WebP, pick a phone, tablet, laptop, browser window or card, and adjust the angle, lighting and background.

Export a PNG with a solid, gradient or transparent background, in 1:1, 4:5, 16:9, 9:16 or 3:1, at 1x, 2x or 3x. It is free to use without an account. It needs JavaScript and WebGL 2, and the page says screenshots stay in your browser. There is no video export.